If you check the ones from the big box stores, they all have replaceable bulbs. This was done due to consumers lack of understanding of the difference between an LED and an incandescent, that being the LED lasts thousands of hours and doesn't burn out like an incandescent does. The ones that were originally available had sealed bases, the big box stores could not sell them because Joe consumer couldn't replace a burned out bulb. Thus the new trend of replaceable bulbs, worst thing you could do to an LED. This allows moisture to seep into the base causing corrosion and contact issues. I have several of the originally available ones that have sealed bases which have no problems, I also have several of the newer style with replaceable bulbs that are constantly having issues. The only issue I have ever had with one set with sealed bases is I needed to replace one half of the bridge rectifier.